Bathtub sidewall channelling



FIG. 1 is a side elevation view of a bathtub sidewall channeling showing my new design, it being understood the opposite side is a mirror image thereof;

FIG. 2 is an end view of FIG. 1;

FIG. 3 is an opposed end view of FIG. 1; and,

FIG. 4 is a bottom view of FIG. 1.

The broken line shown in the drawing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a bathtub sidewall channelling, as shown and described. 